Fluid pressure relay



July 18, 1939,

A. HocHscHuLz' FLUID PRESSURE RELAY Filed narciso, 1937 Patented .July18, 1939 UNITED STATES FLUID PRESSURE RELAY Aurea noehselmlz,v chicago,n1., assigne-- Askania-Werke A. G., a German company Application March30, 1937, Serial No. 133,903

Claims. (Cl. 137-153) This invention relatesl to iluid pressure relays.Fluid pressure relays are used to convert a relatively small or weakimpulse, which may be a force or a displacement, into a relativelystrong 5 pressure iluid impulse, such as a pressure.

One of the simplest and most eiective types of relays is the wellknownfAskania jet-type in which a movable pipe controlled in itsposition by a controlling impulse discharges a `jet of lo pressure iiuidinto one or several reception orifices and thereby creates a pressure inthe same depending on the degree in which the jet-pipe and therespective oriiice or orifices register.

In' order .to apply practically no load to the l5 controlling instrumentthe movable jet-pipe has to be properly balanced and mounted in delicatebearings. A further problem is the supply of prwure fluid tothe jet-pipethrough suitable inlets which operate without friction and a mini- D mumloss of iluid and pressure.

' It is an object of this invention to provide a vrelay of lthe jet-pipetype of simple and rugged construction. According to the presentinvention the jet-pipe is stationary, thereby obviating ilv complicatedbearings and supply inlets whilefthe reception orice is movable by meansof an `loperative connection between the same and the movable part of adevice responsive to the pressure set up in the orifice.

Further aims, objects and.' advantages will appear from a considerationof the description which follows with the accompanying drawing,

- showing embodiments of this invention for illustrative purposes.; Itis to be understood that the description is not to be taken in alimiting sense, the scope of the invention being pointed out in theaccompanying claims.

Referring to the drawing: e

Fig. 1 is a diagrammatic elevation, shown partly in section of ajet-pipe relayl in a connection for, controlling temperature.

Fig. 2 is an enlarged sectional illustration of.

a detail to be used in the relay of Fig. 1.

Fig. 3 is a section taken on line 3-3 of Fig. 2. Fig. 4 shows a modifiedform of relay. n In Fig. 1 a discharge orifice member I0, in thedescription and claims called jet-pipe, is mounted stationary relativeto adiaphragm casing II. The jet-pipe is supplied with pressurelopiluid, such as air, water or oil, from a4 suitable source (notshown).A jet of pressure uid is discharged into a reception orifice v2 of amovable oiiicemember I3, setting up a pressure in the same depending onthe degree in which the jet-pipe and the reception orifice register. The

reception orifice communicates with a pressure responsive device, hereinshown as consisting of the casing II and a movable diaphragm I4. Theorifice member I3 is movable in response to the v movements of thepressure responsive device, for 5 example by virtue of its being mountedon the diaphragm Il.

The operation of the relaywill now be explained in connection with itsapplication to a temperature regulating apparatus shown in Fig. 1` l0 Agas burner I5 is-supplied with gas through a conduit I6 and the supplycontrolled by a diaphragm valve I l. A furnace I8 heated by the burneris equipped with a fluid thermostat bum I9 connected by a line 20 with abellows or Syl- 15 phon 2|. In a well known way the Sylphon will expandand contract in response to temperature changes in the furnace.

The Sylphon mounted' on a stationary part 22 is connected by means of astem 23 to exert a 20' controlling impulse, in this instance a force, onthe relay by tending to displace .the reception orifice member I3relatively to the jet-pipe I0 to register in an increasing degreetherewith. The pressure set upin the orice and conse- 25 quently insidethe diaphragm casing II will increase, thereby exerting a restoringimpulse on the orice memberl3. The restoring` impulse or -action tendsto restore the relatively movable parts of the relay to a neutralposition in which 30 position', thereby diminishing the supply of gas.

Experiments have shown that for normal operating conditions the tendencyof the dia- 45 phragm I4 to assume a centered position is suicient tocenter the reception oriice member.

The reception orice member will automatically assume a position in whichso much pressure fluid is received as is necessary to create a re- 5ostoring impulse for counter-balancing the controlling impulse.

If the relayis subjected to considerable vibrations, on a vehicle forexample, it may be advantageous to provide a centering member for-the.55

reception orifice member. A suitable construction is shown in Fig. 2. s

A guiding stud 251s shown to be secured to the casing Il partly toengage the conduit 26 leading from the orifice to the interior of thediaphragm chamber. In order not to interfere with an exchange ofpressure between the orifice and the diaphragm chamber the stud isprovided with longitudinal recesses 2l serving as a passage for pressurefluid. The stud is shown in cross section in Fig. 3.

A relay for. creating differential pressure impulses is shown in Fig. 4.

The reception orifice member I3' is provided with two orifices I2 andi2" communicating through passages 26 and 26" with diaphragm chambers 2Band 29 formed by the diaphragm il and the casing il', Il. Upondisplacement of the orifice member to the left the pressure inside thechamber 29 will be increased and the pressure in chamber 2l decreased,whereby a differential pressure impulse iscreated which may be taken oi!at hose couplings In and Il.

'Ihe relay of Fig. 4 is shown tc be actuated by a displacement impulseintroduced by moving a cam 32 relatively to its support I3 anddisplacing a stem 34 provided with a roller 35 and guided at 36 foraxial movement. 'I'he displacement of the cam is transmitted into aforce of a spring 31 distorted thereby and connected to act on l therelay.

' controlling and restoring impulses.

Obviously the present invention is not restricted to the particularembodiments thereof herein shown and described. Moreover it is notindispensable that all the features of this invention be used conjointlysince they may be employed advantageously-in various combinations andsubcombinations.

What is claimed is:

1. Fluid pressure relay comprising in combination, a. hollow vesselhaving a movable wall; a stationary jet-pipe the jet issuing from samebeing substantially parallel to the wall; and a reception orifice memberfor receiving said jet, said reception member communicating with theinterior of said vessel and connected to be moved with said walltransversely to said jet to register in a variable degree with said,iet-pipe, whereby, i

Jet-pipe; andv a reception oriiice member com municating with saidpressure responsive device and connected to be moved therewith in adirection transverse to the jet issuing fromvsaid stationary jet pipe toregister in a variable degree with said iet-pipe. whereby, upon adisplacement of said orifice member transversely to said jetplpe by anlmpu1se,'a pressure is created in said pressure responsive device whichis a function of .the impulse.

' to said jet-pipe'by said diaphragm.

rcommunicating with said diaphragm chamber and connected to be movedwith said diaphragm to register in a variable degree with said jet-pipe,whereby, upon a displacement of said orifice member transversely to saidjet-pipe by an out- -side impulse, a pressure is set up within saiddiaphragm chamber which is a function of the impulse.

4. Fluid pressure relay comprising, in combination, a pressureresponsive device; a stationary jet-pipe; a reception orifice membercommunicating with said pressure responsive device and connected to bemoved therewith in a direction transverse to the jet issuing from saidjetpipe to register in a variable degree with said jet-pipe; and meansto exert a-controlling force on said orifice member, whereby, upondisplacement of said orifice member transversely to said jet-pipe, apressure is set up in said pressure responsive device which is a.function of said controlling force.

5. Fluid pressure relay comprising.- in combination, a pressureresponsive device; a stationary jet-pipe; a reception orifice member forreceiving the jet issuing from said jet-pipe, said reception membercommunicating with said pressure responsive device and connected to bemoved therewith in a direction transverse to said jet to register in avariable degree with said jet-pipe; I and means to exert a controllingdisplacement impulse on said orifice member, whereby upon displacementof said orifice member transversely to said jet-pipe, a pressure is setup in said pressure responsive device which is a function of said 4controlling displacement.

`6. Fluid pressure relay comprising, in combination, a pressureresponsive device; a stationary jet-pipe; a reception orifice membercommunicating with said pressure responsive device and connected to bemoved therewith to register in a variable degree with said jet-pipe; aspring connected to act on said orifice member; and means for distortingsaid spring, whereby a displacement of said orifice member relatively toc said jet-pipe is caused and a pressure set up in said pressureresponsive device which is a function of the distortion of the spring.

7. Fluid pressure relay comprising, in combination, a differentialpressure responsive device; a I stationary jet-pipe; and an orificemember having two reception orifices and conduits communieating withsaid pressure responsive device, said orifice member being connected tobe actuated by said differential pressure responsive device for the ereception orifices to register in a variable degree with the saidJet-pipe; whereby, upon a displacement of said member relatively to saidJet-pipe,

, a differential pressure is created in the orifices which is a functionof the displacement. u 8. Fluid pressure relay comprising incombination, a diii'erential pressure responsive diaphragm; vastationary jet-pipe; and an orifice member having two receptionorifices, each connected to transmit fluid pressure to act on one 7 sideof said diaphragm, said orifice member being operatively connected to bedisplaced relatively 9. In a duid pressure relay a stationary jetpipe; amovable member having a reception ori- I flce arranged to be movedtransverse to the jet issuing from said jet-pipe; anda device responsiveto the pressure set up in the reception oriiice and connected todisplace said member transversely to said jet-pipe.

10. In a fluid pressure relay a stationary jetpipe; a movable receptionorifice member having two orices and arranged to be moved transverse tothe jet issuing from said jet-pipe; and a device responsive to adifferential pressure set up in the reception oriilces and connected todisplace said member transversely to said jet-pipe.

11. Fluid pressure relay comprising, in combination, a stationaryjet-pipe; a movable member having a reception orifice arranged to bemoved by an' impulse transverse to the jet issuing from said jet-pipe;means connected to exert a controlling acton on said member; and meansresponsive to the pressure set up in the reception orice and connectedto exert a restoring action on said member. I

12. Fluid pressure relay comprising, in combination, a stationaryjetpipe; a movable member having two reception orifices, said memberbeing arranged to be moved transverse to the jet issuing from saidjet-pipe; means connected to exert a controlling action on said member;and means responsive to the diierential pressure set up in the receptionorices and connected to exert a restoring action on said member. Y

13. Fluid pressure relay' comprising, in combination, a diaphragmcasing; a movable diaphragm mounted thereon to form a chamber therewith;a jet-pipe mounted stationary relatively to said casing the jet issuingfrom said jetpipe being substantially parallel to said diaphragm; and amember mounted on said diaphragm to be movable therewith, said memberhaving an oriiice arranged to be moved transverse to said jet and apassage connecting said orice with the interior of the chamber.

14. Fluid Ipressure relay comprising, in combination, a diaphragmcasing; a movable diaphragm mounted thereon to form a chamber therewith;a jet-pipe mounted stationary relatively to said casing; a membermounted on said diaphragm to be movable therewith, said member having anorifice arranged to coact with said jet-pipe and a central boreconnecting said ori- Iice with the interior oi' the Ichamber; and aguiding stud mounted on the casing, said stud having longitudinal recessand engaging the central passage of said member.

15. Fluid pressure relay comprising, in combination, a diaphragm casing;a movable diaphragm mounted therein to form two chambers therewith; ajet-pipe mounted stationary rela- .other and arranged to coact with saidjet-pipe and passages connecting each orifice with a chamber.

ALFRED HOCHSCHULZ.

